Apparatus for feeding boiler compounds



(No Model.)

v J.'O..DOLAN.

APPARATUS FOR FEEDING BOILER COMPOUNDS No. 361,679. 'PatentedApr226Q188'7.

INVENTOR,

N. PETERS. Phnlu-Lilhngmphur. Wnshinglun, D. c.

UNITED STATES FATENT Tries.

JOHN G. DOLAN, OF PITTSBURG, PENNSYLVANIA.

APPARATUS FOR FEEDING BOILER COMPOUNDS.

SPECIFICATION forming part of Letters Patent No. 361,679, dated April 26, 1887.

Application filed February 5, 1887. Serial No. 226,658. (No model.)

To all whom it may concern-.-

Be it known that I, JOHN C. DOLAN, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Feeding Boiler Compounds; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention is designed to provide an improved case for distributing in boilers any of the chemical compounds commonly employed for preventing the incrustatioii of the boilers with scale, its object being to feed the com pound to the boiler-water slowly and in regular quantities.

The invention is illustrated in the accompanying drawings, in which Figure lis a side view of the case as su pended in the water of a steam-boiler. Fig. 2 is an end view of the case. Fig. 3 is a vertical crosssection on the lines so a: of Figs. 1 and 6.. Fig. 4 is a plan view of part of the case. Fig. 5 is a vertical longitudinal section on the liney y of Fig. 4, showing one end of the distributing-tubes, together with a part of the shell of the case. Fig. 6 is a similar section showing the tubes in connection with the case, this figure being designed to illustrate a change in the position of the parts. Fig. 7 is a vertical longitudinal section similar to Fig. 5, showing the other end of the distributing-tubes, and, in connection with Figs. 5 and 6, showing the circulation of the water through the apparatus. Fig. 8 is a perspective view of part of the feed-bar.

Like symbols of reference indicate like parts in each.

In the drawings, 2 represents the main case or receptacle, which contains the chemical compound. Its general outline is that of an irregular cylinder-that is to say, at one,

end it is circular in cross section and at the other end it is oval or elliptical, (see Fig. 2;) or it may be elliptical at one end and polygonal at the other; or it may be otherwise formed so that at one end its cross-section shall more closely approach a true circle than the other end. I shall explain the purpose of this here inafter.

On the outside of the case 2 is an inverted V or U shaped chamber, 3, which, like the case 2, is closed at both ends. Between the inner sides of the chamber 3 is a chamber, 4, open at both ends. The chambers 3 and 4 preferably extend nearly from end to end of 'the case 2. The legs of the chamber 3 communicate with the interior of the case2 through perforations 5.in the shell of the case. The chambers 3 and 4 are also in communication through perforations 6.

Within the chamber 4 is a bar, 7, which is transversely curved into the shape or approximately the shape of the chamber 4, and is adapted to fit snugly within the chamber, but yet loosely enough to permit it to slide longitudinally therein. The ends of the bar 7 proj ect outside of the chamber 4, and afford means for the attachment of rods or chains 8, by which the case is suspended in the boiler. The upper part of the bar is provided with holes 9, which are in the same vertical plane as the holes 6.

There are series of holes 6 and 9 near both ends of the chamber 4, and the holes of the series at each end are preferably arranged, as shown in Figs. 4:, 5, 6, and 7, so that only one pair of holes in each series shall be in register at the same'time; and there isa sufficient num-' ber of the holes that, whatever be the position of the bar 7, there shall always be one pair of holes in register ateach end. At each end of the bar 7 portions of its sides are bent outward to constitute stops 10, which limit the longitudinal motion of the bar and prevent its being moved so far in the chamber 4 as to throw the holes 6 and 9 out of register.

, The operation'of the device is as follows: The case 2 is filled with the desired chemical compound, soluble in water, and is suspended inside the boiler by the chains 8, so that the case shall be immersed in the water of the boiler, as shown in Fig. 1. When the boiler is in use, by reason of the form of the case before described,- the irregular pressure of the steam will tend to distort the circular end of the case less than the other end, which is not circular, because the one opposes more resistance than the other, and the holes time not large enough to allow the pressures inside and outside of the case to immediately adjust themselves t'wequilibrio after the frequently-recurring changes or pulsations in pressure caused by the action of the engine valves. As a result, there is an agitation of the case,which will tend to force the contents out through the perforations 5 at one end thereof after they have been dissolved by the entrance of the boiler-water. In Fig. 7 this outward current is shown by the several arrows. Its direction is as follows: from the case 2 through the holes 5 into the chamber 3, thence downward through the registering holes 6 and 9 into the chamber4,and finally through this chamber into the boiler-water. This outward current at one end of the case 2 will of course induce an inward current of water at the other end. It is shown in Figs. 1, 5, and 6. From the boiler the water passes into the chamber 4, upward through the registering holes 6 and 9 into the chamber 3, and thence down through theholes 5into the case. In this way there is maintained a uniform flow of the dissolved chemical out of the case intothe boiler and a corresponding inflow ofwater to fill its place; but by reason of the several chambers and the bar 7 the circulation is so slow that the substance in the case is not wasted, and the contents of a single case may be used for a long time without renewal.

The reason for fitting the bar 7 in the chamber 4 so that it is capable of a longitudinal motion therein is that when it is moved byagitation of the case it may clear the holes 6 from sediment, and so keep them open. By

' having the bar so arranged it also allows the water and the dissolved chemical to escape between it and the inside wallof the chamber 4 by capillary action. The holes 9 in the bar may therefore be omitted without altogether destroying the efficiency of the apparatus.

The agitation of the chemical compound in the case is secured by making the case of ir' regular shape, as already explained, so that 'less resistance shall be offered to pressure at one end than at the other. The same result may be had in the same way by making the case cylindriform and having its sides thicker at one end than at the other, so that the thinner end shall yield more to the steam-pressure than the other. I intend to claim this irregularly-shaped case independently of the other parts of the apparatus.

I do not desire to limit myself to the precise form of the chambers 3 and 4 which I have shown and described, since they may be otherwise shaped; but

What I claim is+ 1. In a, feeding apparatus for boiler com-' pounds, a case for containing the compound, said case being irregularly shaped, substantially as described, so that at one partits sides shall offer less resistance to pressure than at another, as andlfor the purposes specified.

2. In a feeding apparatus for boiler compounds, an oblong case for containing the compound, said case being of irregular cross-section, so that at one end its cross-section shall be more nearly circular than at the other end, substantially as and for the purposes described.

3. In a feeding apparatus for boiler com-v pounds, the combination, with a case for containing the compound, of an external chamber communicating with the case and with the 5. In a feeding apparatus for boiler compounds, the combination, with a case for con- Y taining the compound, of the external chamber, 3, communicating therewith, and a chamber, 4, within the external chamber and communicating with the boiler, and also commutions 6, substantially as and described.

6. In a feeding apparatus for boiler compounds, the combination, with a case for confor the purposes taining the compound, of the external chamber communicating therewith, a chamber, 4, Within the external chamber, communicating with the boiler, and also communicating with the chamber 3 through perforations 6, and the bar fitting loosely within the chamber 4 against the perforations 6, substantially as and for the purposes described.

7. In a feeding apparatus for boiler compounds, the combination, with a case for containing the compound, of the external chamber, 3, communicating therewith, a chamber, 4, within the external chamber,communicating with the boiler, and also communicating with the chamber 3 through perforations 6, and a perforated bar fitting loosely within the chamher 4, substantially as and for the purposes described.

8. In a feeding apparatus for boiler compounds, the combination, with a case for containing the compound, of the external chamber, 3, communicating therewith, a chamber, 4, within the external chamber and communicating with the boiler, and also communicating with the chamber 3 through perforations 6, a bar fitting loosely within the chamber 4 against the perforations 6, and supportingchains 8, attached to said bar, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 4th day of February, A. D. 1887.

. JOHN G. DOLAN.

\Vitnesses: I

' THOMAS W..BAKEWELL,

W. B. CORWIN.

"nicating with the chamber 3 through perfora- 

